Add eval japanese prime minister (openai#1422)

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## Eval details 📑

### Eval name

 japanese_prime_minister

### Eval description

I would like to know the calculation of the number of days in office of
successive prime ministers and the ranking of the number of days in
office.

### What makes this a useful eval?

I'm almost done calculating tenure, but trying to rank it doesn't work.
There seems to be a demand for ranking a lot of different things.

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### Eval JSON data

Since we are using Git LFS, we are asking eval submitters to add in as
many Eval Samples (at least 5) from their contribution here:

<details>
  <summary>View evals in JSON</summary>

  ### Eval
  ```jsonl
{"input": [{"role": "system", "content": "あなたは日本の歴代総理大臣の名前を回答します"},
{"role": "user", "content": "通算在籍日数が1番目に長い総理大臣"}], "ideal": "安倍晋三"}
{"input": [{"role": "system", "content": "あなたは日本の歴代総理大臣の名前を回答します"},
{"role": "user", "content": "通算在籍日数が2番目に長い総理大臣"}], "ideal": "桂太郎"}
{"input": [{"role": "system", "content": "あなたは日本の歴代総理大臣の名前を回答します"},
{"role": "user", "content": "通算在籍日数が3番目に長い総理大臣"}], "ideal": "佐藤栄作"}
{"input": [{"role": "system", "content": "あなたは日本の歴代総理大臣の名前を回答します"},
{"role": "user", "content": "通算在籍日数が4番目に長い総理大臣"}], "ideal": "伊藤博文"}
{"input": [{"role": "system", "content": "あなたは日本の歴代総理大臣の名前を回答します"},
{"role": "user", "content": "通算在籍日数が5番目に長い総理大臣"}], "ideal": "吉田茂"}
  ```
</details>

evals/registry/evals/japanese_prime_minister.yaml

@@ -0,0 +1,8 @@
+japanese_prime_minister:
+ id: japanese_prime_minister.dev.v0
+ metrics: [accuracy]
+
+japanese_prime_minister.dev.v0:
+ class: evals.elsuite.basic.includes:Includes
+ args:
+ samples_jsonl: japanese_prime_minister/samples.jsonl